![]() To do this, you need to have the Java Extension Pack and the Spring Boot Extension Pack installed. There are many ways to create a new Kotlin project, but I will use the Spring Initializr in VS Code. Optional: VS Code with the following extensions: (Optional): Postman and Tableplus to follow along, but any testing tool will work.We will go with a step-by-step guide, so you can follow along. Test the application with Postman and Tableplus. ![]() Create docker-compose.yml to run the database and the application.Create User.kt, UserRepository.kt and UserService.kt.Create a Spring Boot project using Spring Initializr.We will create 5 endpoints for basic CRUD operations: Here is a schema of the architecture of the application we are going to create: That’s why the Hypersistence Utils project uses the Hibernate API to provide additional column type mappings.Let's create a CRUD Rest API in Kotlin, using:Īll the code is available in the GitHub repository (link in the video description): While JPA defines the AttributeConverter interface, the standard converters are way too limited when it comes to mapping arrays or JSON types. If you enjoyed this article, I bet you are going to love my Book and Video Courses as well. I'm running an online workshop on the 20-21 and 23-24 of November about High-Performance Java Persistence. Great! Now, we can also update the Event entities too:Įvent event = entityManager.find(Event.class, 1L) Īnd Hibernate is going to generate the following SQL UPDATE statement: Hibernate is going to generate the following SQL statement: When persisting these two Event entities: The StringArrayType and IntArrayType are classes offered by the Hypersistence Utils project. Getters and setters omitted for brevityĪnd for Hibernate 5, like = "string-array", typeClass = "int-array", typeClass = IntArrayType.class) Public class Event extends BaseEntity = "sensor_names", The JPA mapping for the event database table will look as follows.įor Hibernate 6, the mapping will look as = "event") ![]() Based on the Hibernate version you’re using, you will have to add the proper Hypersistence Utils Maven dependency.įor instance, if you’re using Hibernate 6.1 or 6.0, you can add this dependency:Ĭheck out the Hypersistence Utils for more details about the proper dependency you should be using. The first thing you need to do is to set up the Hypersistence Utils Maven dependency in your project pom.xml configuration file. ![]() So, we are going to use the Hypersistence Utils project to achieve this goal. However, neither JPA nor Hibernate support SQL arrays by default, and we want to map these arrays to String and int Java arrays, respectively. We want to map this table using JPA and Hibernate. All you need to do is use the Hypersistence Utils open-source project.Ĭonsidering we have the following table in our PostgreSQL database schema: However, while you can create your own custom Hibernate Types for mapping PostgreSQL arrays, you don’t need to implement your own Hibernate Type. Hibernate custom Types allow you to map all sorts of database-specific column types, like IP address, JSON columns, bit sets, or SQL arrays. In this article, we are going to see how you can map SQL arrays to JPA entity attributes when using Hibernate. So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night! Well, Hypersistence Optimizer is that tool!Īnd it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework. Follow having a tool that can automatically detect JPA and Hibernate performance issues.
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